# C2PA Content Authenticity Guide
The Coalition for Content Provenance and Authenticity (C2PA) is the leading technical standard for marking AI-generated content. This guide explains how to implement it for EU AI Act compliance.
## What is C2PA?
C2PA is an open technical standard that allows content creators to attach cryptographically signed metadata to media files. This metadata includes:
- **Provenance**: Who created the content
- **Process**: What tools and AI models were used
- **Authenticity**: Cryptographic proof the metadata hasn't been tampered with
## Why C2PA Matters for Article 50.2
The EU AI Act Article 50.2 requires that AI-generated content be marked in a "machine-readable format." C2PA satisfies this requirement by providing:
1. **Standardized metadata structure**
2. **Cryptographic integrity verification**
3. **Cross-platform compatibility**
4. **Industry-wide adoption** (Adobe, Microsoft, OpenAI, etc.)
## How C2PA Works
### The Manifest
C2PA uses a "manifest" - a JSON-LD document embedded in the image file that contains:
```json
{
"assertions": [
{
"label": "c2pa.ai_generated",
"data": {
"description": "This image was generated using AI"
}
},
{
"label": "c2pa.software.agent",
"data": {
"name": "DALL-E 3",
"version": "2024"
}
}
]
}
```
### The Signature
Each manifest is cryptographically signed, allowing anyone to verify:
- The content hasn't been altered
- The metadata is authentic
- The claimed creator is genuine
## Implementing C2PA
### For AI Image Generators
1. **Generate the image** using your AI model
2. **Create a C2PA manifest** with AI generation assertions
3. **Sign the manifest** with your organization's certificate
4. **Embed in the image** (JPEG, PNG, WebP supported)
### Tools for Implementation
- **c2patool** - Command-line tool for adding C2PA metadata
- **c2pa-rs** - Rust library for programmatic integration
- **Adobe Content Credentials** - No-code solution for creatives
## Verifying C2PA Content
Users can verify C2PA metadata using:
- **Content Credentials Verify** (verify.contentcredentials.org)
- **Adobe Photoshop** (built-in verification)
- **Custom implementations** using c2pa-rs
## Common Questions
### Is C2PA mandatory for EU AI Act compliance?
No, but it's the most widely adopted standard that satisfies Article 50.2's requirement for machine-readable marking.
### Can C2PA metadata be removed?
Yes, but this would constitute a deliberate attempt to circumvent compliance obligations, which could increase liability.
### Does C2PA work with all image formats?
C2PA supports JPEG, PNG, WebP, GIF, and several video formats (MP4, MOV).
## Compliance Checklist
- [ ] Implement C2PA manifest generation
- [ ] Include AI generation assertions
- [ ] Sign manifests with valid certificates
- [ ] Test verification process
- [ ] Document your implementation
## Automate C2PA Compliance
SentinelGo can automatically validate C2PA metadata in your images and flag missing or invalid content credentials.
[Check Your Images for C2PA Compliance](/dashboard)